mirror of https://github.com/kubernetes/kops.git
115 lines
3.9 KiB
Go
115 lines
3.9 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package gcemodel
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import (
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"k8s.io/klog"
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"k8s.io/kops/pkg/apis/kops"
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"k8s.io/kops/upup/pkg/fi"
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"k8s.io/kops/upup/pkg/fi/cloudup/gcetasks"
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)
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// ExternalAccessModelBuilder configures security group rules for external access
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// (SSHAccess, KubernetesAPIAccess)
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type ExternalAccessModelBuilder struct {
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*GCEModelContext
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Lifecycle *fi.Lifecycle
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}
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var _ fi.ModelBuilder = &ExternalAccessModelBuilder{}
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func (b *ExternalAccessModelBuilder) Build(c *fi.ModelBuilderContext) error {
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klog.Warningf("TODO: Harmonize gcemodel ExternalAccessModelBuilder with awsmodel")
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if len(b.Cluster.Spec.KubernetesAPIAccess) == 0 {
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klog.Warningf("KubernetesAPIAccess is empty")
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}
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if len(b.Cluster.Spec.SSHAccess) == 0 {
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klog.Warningf("SSHAccess is empty")
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}
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// SSH is open to AdminCIDR set
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if b.UsesSSHBastion() {
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// If we are using a bastion, we only access through the bastion
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// This is admittedly a little odd... adding a bastion shuts down direct access to the masters/nodes
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// But I think we can always add more permissions in this case later, but we can't easily take them away
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klog.V(2).Infof("bastion is in use; won't configure SSH access to master / node instances")
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} else {
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c.AddTask(&gcetasks.FirewallRule{
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Name: s(b.SafeObjectName("ssh-external-to-master")),
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Lifecycle: b.Lifecycle,
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TargetTags: []string{b.GCETagForRole(kops.InstanceGroupRoleMaster)},
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Allowed: []string{"tcp:22"},
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SourceRanges: b.Cluster.Spec.SSHAccess,
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Network: b.LinkToNetwork(),
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})
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c.AddTask(&gcetasks.FirewallRule{
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Name: s(b.SafeObjectName("ssh-external-to-node")),
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Lifecycle: b.Lifecycle,
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TargetTags: []string{b.GCETagForRole(kops.InstanceGroupRoleNode)},
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Allowed: []string{"tcp:22"},
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SourceRanges: b.Cluster.Spec.SSHAccess,
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Network: b.LinkToNetwork(),
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})
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}
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// NodePort access
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{
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nodePortRange, err := b.NodePortRange()
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if err != nil {
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return err
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}
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nodePortRangeString := nodePortRange.String()
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t := &gcetasks.FirewallRule{
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Name: s(b.SafeObjectName("nodeport-external-to-node")),
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Lifecycle: b.Lifecycle,
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TargetTags: []string{b.GCETagForRole(kops.InstanceGroupRoleNode)},
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Allowed: []string{
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"tcp:" + nodePortRangeString,
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"udp:" + nodePortRangeString,
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},
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SourceRanges: b.Cluster.Spec.NodePortAccess,
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Network: b.LinkToNetwork(),
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}
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if len(t.SourceRanges) == 0 {
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// Empty SourceRanges is interpreted as 0.0.0.0/0 if tags are empty, so we set a SourceTag
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// This is already covered by the normal node-to-node rules, but avoids opening the NodePort range
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t.SourceTags = []string{b.GCETagForRole(kops.InstanceGroupRoleNode)}
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}
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c.AddTask(t)
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}
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if !b.UseLoadBalancerForAPI() {
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// Configuration for the master, when not using a Loadbalancer (ELB)
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// We expect that either the IP address is published, or DNS is set up to point to the IPs
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// We need to open security groups directly to the master nodes (instead of via the ELB)
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// HTTPS to the master is allowed (for API access)
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c.AddTask(&gcetasks.FirewallRule{
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Name: s(b.SafeObjectName("kubernetes-master-https")),
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Lifecycle: b.Lifecycle,
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TargetTags: []string{b.GCETagForRole(kops.InstanceGroupRoleMaster)},
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Allowed: []string{"tcp:443"},
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SourceRanges: b.Cluster.Spec.KubernetesAPIAccess,
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Network: b.LinkToNetwork(),
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})
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}
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return nil
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}
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